326 VERTEBRATE ANIMALS OF THE UNITED STATES 



T. b. navus Merr. Much smaller; color lighter: Sacramento Valley. 



T. b. mewa Merr. Size smaller ; color darker : east side of San Joaquin 

 Valley. 



T. b. angularis Merr. Size large; color light: west side of San Joaquin 

 Valley; also Santa Clara and San Juan Valleys. 



T. bulbivorus (Richardson). Color dark brown, above and below; 

 length 300 mm.; tail 90 mm.; hind foot 42 mm.; mammae 4: Willamette 

 Valley. 



T. townsendi (Bachman). Color dark gray above, buff below; 

 length 305 mm.; tail 100 mm.; hind foot 38 mm.; in dark color phase 

 black all over: southern Idaho and Oregon and northern Nevada. 



T. alpinus Merr. Color yellowish brown, being darker along the 

 back and lighter on the belly; length 222 mm.; tail 61 mm.; hind foot 

 30 mm.: upper levels of the southern Sierras. 



T. perpallidus Merr. Color buff or cream above, whitish beneath; 

 length 241 mm.; tail 84 mm.; hind foot 31 mm.; mammas 4 pairs: 

 deserts of southern California to New Mexico and Colorado. 



Subspecies of T. perpallidus 



T. p. perpallidus Merr. Colorado desert, southern Cahfornia, 



T. p. perpes Merr. Size small; color gray: eastern California from 

 Owens Valley to Hesperia. 



T. p. canus Bailey. Color grayish buff; size rather large: western 

 and central Nevada. 



T. p. aureus Allen. Color golden buff; size rather large: southern 

 Nevada and Utah, western Colorado, New Mexico and Arizona. 



T.fulvus (Woodhouse). Color dark tawny or light chestnut; length 

 219 mm.; tail 70 mm.; hind foot 30 mm.; mammae 4 pairs: Arizona to 

 Texas. 



Subspecies of T. fulvus 



T. f. fulvus (Woodh.). Central Arizona and western and central 

 New Mexico. 



T.f. toUecus Allen. Color paler and grayer: southeastern Arizona 

 and southwestern New Mexico. 



T. talpoides (Richardson) (Fig. 174). Color dark gray or grayish 

 brown; under parts whitish or pure white; tail white tipped or all white; 

 length 214 mm.; tail 60 mm.; hind foot 28 mm.; mammae 6 pairs: South 

 Dakota, Colorado and Wyoming northward into Canada. 



